docs: def _find_player_id(self, row):
          """
          Find the player's ID.
  
          Find the player's ID as embedded in the 'data-append-csv' attribute,
          such as 'zettehe01' for Henrik Zetterberg.
  
          Parameters
          ----------
          row : PyQuery object
              A PyQuery object representing a single row in a boxscore table for
              a single player.
  
          Returns
          -------
          str
              Returns a ``string`` of the player's ID, such as 'zettehe01' for
              Henrik Zetterberg.
          """
          player_id = row('th').attr('data-append-csv')
          if not player_id:
              player_id = row('td').attr('data-append-csv')
          return player_id